Dolly-driving mechanism for drill-sharpening and other machines.



D G. LEYNBR.

" DOLLY DRIVING MBGHANISM FOR DRILL SHARPENING AND OTHER MACHINES.

APPLIOATION FILED APR. 9, 1912.

Patented May 12, 1914. l 2 SHEETS-SHEET 1.

COLUMBIA PLANOGRAPM C0.. WASHINGTDN. D.

J. G. LBYNER.

DOLLY DRIVING MBGHANISM FOB. DRILL SHARPENING AND OTHER MACHINES.

APPLICATION FILED APB.. 9, 1912.

1 ,096,438. Patented May 12 1914.

2 SHEETS-SHEET 2.

11M!! A 4 4950 f/ 247 COLUMBIA PLANDGRM'H C0.. WASHINGTON. D. C.

JOHN GEORGE LEYNER, 0E DENVER, COLORADO.

DOLLY-DRIVING- MECHANISM FOR DRILL-SHARPENING AND OTHER MACHINES.

Specification of Letters Patent.

Patented May 12, 1914:.

Original application filed March 25, 1912, Serial No. 686,133. Divided and this application filed April 9, 1912. Serial No. 689,665.

To all whom it may concern Beit known that I, JOHN Gnonen Lernen, a citizen of the United States of America, residing in the city and county of Deliver' and State of Colorado, have invented a new and useful Dolly-Driving Mechanism for Drill-Sharpening and other Machines, of which the following is a specification.

My invention relates to a dolly driving mechanism for drill sharpening and other machines, and the objects of my invention are: First, to provide a dolly driving mechanism that is adapted to be applied to any kind or type of fluid operated drill sharpening and to other forgings upsetting machines. Second, to provide a dolly driving mechanism adapted to drill sharpening machines, that is arranged to be driven in one direction of its reciprocal movement by the forward strokes of a fluid actuated hammer piston reciprocally mounted in an operatively arranged cylinder, and in the opposite direction of its reciprocal movement by a spring assisted by the suctional force of the rearward stroke of the hammer piston of the cylinder. And third, to provide a dolly driving mechanism that is provided with a slideway and a feeding mechanism by which it can be fed away from the drill steel holding jaws far enough to insert and remove the dollies from their support, and that is provided with means by which it can be set and secured against accidental displacement in any desired part of its slideway, and with the dolly in any desired position relative toy the die jaws of the anvil and hammer of the machine. I attain these objects by the mechanism illustrated in the accompanying drawings, in which:

Figure l is a side elevation partly in section, of a drill Sharpener, illustrating my improved dolly driving mechanism supported in operative relation thereto. Fig. 2 is a plan view of Fig. 1. Fig. 3 is a vertical,.

longitudinal, sectional view through the hammer piston cylinder, the slideway therefor, and the feed mechanism for moving the cylinder on the slideway. Fig. 4, is a vertical, transverse, sectional view on the line i-ll of Fig. 2, looking in the direction of the arrow. And Fig. 5, is a front end view of the dolly.

Similar letters of reference refer to similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates a column that forms the foundation base of an operative drill Sharpener, hereinafter termed the base. This column form of base is provided with a floor flange 2 and with a cylinder bore 3, and at its top end a cylinder 3^ is secured to it in any suitable manner. The top of this cylinder 3^ is provided with an anvil portion f1, and above the anvil a hammer block 5 is reciprocally mounted on bolts or rods 6 that are connected at one of their ends to the hammer block and that extend slidably down through the anvil and are secured at their opposite ends to the upper end of a piston head 7, that is reciprocally mounted in a cylindrical bore 3B, formed in the cylinder 3^'. The bolts or rods 6 preferably extend down through the piston head and are secured to it by nuts 9.

The piston head is preferably a differential ended piston, the upper end 7 being of disk form, and from this disk-shaped end a stem portion 8 depends into the cylinder 3, of the base. The disk portion and also the stem portion are provided with packing rings 8^. A throttle valve l0, which may be of any suitable multiple port type, and which is provided with a handle 10A, is secured to the side of the machine and is arranged to admit compressed air by a pipe 11, to the lower end of the piston head to raise it in its cylinder and to its upper end, through suitable ports, to move it down in its cylinder alternately, which reciprocal movement of the piston imparts reciprocal movements to the hammer block, which is so relatively connected to the stroke of the piston head in its cylinder and to the top forging surface of the anvil that it reciprocates vertically above it in hammer blow striking relation to it, and the opposing faces of both the anvil and the hammer block are arranged to receive interchangeable drill bit forming, sharpening and shanking die jaws 1lA and 11, and also die jaws for making other kinds of die formed forging work. These die jaws are held in recesses formed in the anvil and hammer block by bolts 11C and 11D, which are arranged in slots to clamp the jaws in their recesses. The upper bolt is secured against dropping out of its recess when loosened by an expansive spring 11E, which holds it by pressure in its slot.

A more complete description of a machine embodying the above mentioned elements is given in my pending application, Serial Number 686,133, filed March 25, 1912, of

ldrill sharpening machine, independently of the drill bit holding vise operating` part. The arin 12 projects from one side of the cylinder far enough to form a support for an engine cylinder 13, which is slidably mounted thereon in axial alinement with the longitudinal axis of the die jaws of the vise.

rlhis cylinder is arranged on the supporting arm to be moved reciprocally to and from the vise jaws and it is also arranged to bey clamped rigidly to the support when set in its dolly operating position. There are several ways in which the engine cylinder may be adjustably secured and reciprocally' moved on the supporting arm.

My invention contemplates any means by which the reciprocal feeding and adjustably setting and clamping features of my invention may be obtained. l preferably, however, carry out this feature of my invention in the following manner: The upper end of the arm is provided with a table portion 1.4-, the opposite side edges of which are parallel to each other, and are provided with slideways 15, and the lower side of the cylinder is provided with a depending and rearwardly extending base portion 16, the bottom edge of which is provided with guideways that fit over and bear slidingly` against the slideways of the cylinders supporting arm. A longitudinal recess 17 is formed in and along the whole length of the bottom of the depending base portion of the cylinder centrally between the guideways, and clamping bolts 1S are extended at right angles to the guideways through lug portions 19 and 20 formed on the opposite sides of the base portion of the` cylinder, and these bolts extend from one side through the base and beyond the other side, and a nut 21 is threaded to the end of each bolt and bears against `the lug on t-he opposite side of the base. rhese lugs are provided with recesses in which the heads of the bolts lit loosely, but close enough to prevent them from turning. By tightening up the nuts of the clamping bolts the guideways of the base portion of the cylinder are sprung together and are thus clamped tightly and rigidly to the slideways of the cylinders supporting arm, and when the nuts are loosened the cylinder can be moved slidingly alongthe guideway of the arm toward and away from the `drill steel clamping vise.

My invention contemplates any suitable means for moving the cylinder on its supporting arm. Thus, it could be moved by the hand of an operator or by any other suitable means. 1 preferably, however, employ a feed scre v 22, which is arranged to be rotatably mounted in a rearwardly extending arm portion 23 that projects from the rear end of the cylinder and is divided for a portion of its length by the recess 17 into 'two side portions, but that unite in one arm end portion at their outer ends. rEhe outer end of this arm is provided with a hub portion 241;, through the upper end of which into the arm a short distance a clamping slot 25 is formed. The hub is provided with an aperture parallel with the axis of the cylinder and above it a bolt hole is drilled through the slotted portion of the arm at right angles to the aperture in the hub, and a bolt 26 is placed through the bolt hole and draws the two divided portions of the hub and arm together. One end of the feed screw is rotatably fitted in the aperture in the hub and is provided with a collar portion 27 that is arranged to bear against the inside of the end of the hub portion of the arm, while the adjacent terminal end of the feed screw extends beyond the outside end of the hub and its end is threaded, and the hub of a crank handle 28 is provided with a threaded aperture that is adapted to be screwed onto the end ofthe feed screw against a shoulder portion 29. The hub of the crank handle is provided with a depending lug portion 30, which is slotted centrally into the bore of the hub, and is also provided with a bolt aperture that extends through it at right angles to its slot, anda bolt 31 is inserted in this aperture and is adapted to draw the parts of the lug on opposite sides of the slot and clamp the hub of the crank handle to the threaded end of the feed screw, while the clamping bolt 26 is used to clamp the hub of the arm 23 tight enough to the feed screw to prevent the feed screw from turning accidentally in either direction. rlhis feed .screw is made long enough to extend from this arm under the base portion and through a central recess 32 formed in the top surface of the cylinders supporting arm, and is adapted to permit the hammer cylinder to be fed backward far enough away from the drill steel gripping vise to permit the dolly to be inserted in or removed from the dolly supporting head of 'the cylinder, and it is threaded. into and ythrough a nut 33 which is secured to the hammer cylinders supporting arm, the nut being arranged to set ina recess 3d that is formed in the top surface of the arm in alineinent with the central recess 32 The nut is provided with a collar portion 36 which lits into an enlarged annular groove 35, that is formed adjacent to the recess 34. One end of the nut is threaded and it projects beyond the end of the arm, and a nut 37 is threaded to it and is turned up against the end oi the arm and clamps the collar of the nut against the side of the enlarged groove 35 nearest to the end of the arm and or' the nut.

The cylinder comprises the cylindrical shell 13 in which a main cylindrical bore 3S is formed, and that is also provided with a forwardly extended bore portion 39, ot' larger diameter than the bore 3S. The bore 38 is the hammer piston bore, and a hammer piston 40, is reciprocally mounted in it. rlhis hammer piston is provided with a hammer bar extension dl, which projects torward through the bore 39. The bore 39 is larger in diameter than the bore 3S and a shoulder 4t2 is formed at the junction ot these two bores. A front cylinder butter and packing ring 43 is made to tit snugly in the bore 39 and rests against the shoulder 4:2, and is provided with an axial bore that is adapted to receive a. cupped leather washer fill, that is arranged to tit into the bore oit the cylinder, and also to tit snugly on the hammer bar extension et the hammer' piston, and a plain cylinder ring d5 is also fitted snugly in the bore 39 and is placed against the sidel of the front cylinder butler ring. This plain cylinder ring is provided with an axial bore through which the hammer bar extension projects, with a close but slidable tit. A cylinder head i6 is secured by side rods 47, which extend through apertures formed in lug portions 4S on the opposite sides o't the head to a rear cylinder head 49, which is also provided with apertured side lugs through which the opposite ends of the bolts extend. These side bolts extend 'tar enough beyond the rear cylinder head to receive expansion coiled springs 50, and a spanner washer 51 is placed across and between the bolts and on both of their ends, and nuts are threaded on the ends of 'the bolts and are screwed against the Spanner washer and cause it to compress the springs 50, and to clamp the twocylinder heads to the oppo site ends of the cylinder, and places the cylinder heads under a resilient clamping pressure that enables them, especially the front cylinder head, to yield under side or other strains or jars that would tend to break them if rigidly secured to the opposite ends of the cylinder. This is especially true ot the front cylinder head which is provided with a` forwardly projecting hub portion 53, which, with the flange portion that forms the front cylinder head, I term the guide flange, as it supports the drill steel sharpening dolly 53^ in an axial aperture 511:, and the dolly, when striking against the uneven ends of drill steel, is subjected to severe side st -ains that are imparted to the dolly and front cylinder head and these resilient tension clamping side bolts receive and cushion these strains. In order to secure the nuts against accidental unscrewing movement, their washer engaging surfaces are provided with diametrically arranged projecting ribs 55, which tit into recesses 5t extending cent-rally across the center ot each et the bolt receiving recesses oi the side ot the spanner washer that :faces the nuts, and the nuts, when tightened up are lett with these ribs projecting into these recesses. The trent cylinder head, which I will hereatter term the guide flange, is provided with an axial bore 57 which registers in alinement with the bore in which the dolly is mounted. This bore is also in alinement with the bore 3S) et the cylinder, but is smaller in diameter than the bore 8i) oi' the cylinder and is larger in diameter than the bore in which the dolly is mounted, and it 'terms a chamber around the engaging ends of the dolly and the hammer piston, while the inner end oit the lront cylinder head is provided with a projecting hub portion 5S that is made to project into the end oi the cylinder against the plain cylinder ring and holds it against the front cylinder butler ring and the itront cylinder butler ring against the shoulder oi the hammer piston cylimler. '.lhe euide ilange to is provided with an automatically operating valve, that is arranged and adapted to relieve the rear end ot the dolly of back pressure from air that leaks past the packing ring ot the hammer piston along its hammer bar portion. By getting rid ol this back pressure the rearward strokes ol the hammer piston exert a suetional drawing -force action on the dolly that assists in moving it on the rearward strokes ot' its reciprocal movement.

My invention contemplates any suitably arranged valve controlled aperture for ett'ecting this result. I prete lably, however, carry out this 'feature oi my invention in lthe following manner: The top surface of the flange portion of the guide flange is provided with an aperture 59, the entrance to which is threaded, and a plug (30 is threaded to it, and is provided with an axial aperture (3l which extends through it into the aperture The bottom oi` the aperture 59 is provided with a converging shoulder (32, and an aperture G3 extends :from the center ot this shoulder through the shell of the [lange into the chamber 57. A ball Gil which -t'orms the valve, is placed in the aperture and rests against the shoulder (32 which forms a valve seat tor it., and an expansive tension spring 65 is placed with one end on the ball and with its opposite end against the inner end of the plug 60 and thus holds the ball by its resilient expansive tension against its seat, and as the ball projects into the aperture 63, it normally holds this aperture closed, eXcept when the hammer piston approaches the end of the dolly, when it forces the air that is in the chamber 57 into the aperture 63, and the air lifts the ball and escapes through the aperture in the plug to the atmosphere. Then when the hammer piston moves backwardly on its rearward stroke it exerts a suctional drawing force on the dolly that assists in moving it on the rearward strokes of its reciprocal movement. The hammer piston cylinder 18 is provided with a valve chest portion 66, which is provided with an air inlet aperture G7, to which a swiveling elbow 68 that forms the adjacent end of an air supply hose 69, is connected. This air hose 69 extends from the three function throttle valve chest, and the elbow is secured to the inlet aperture by a bushing 70, as is above described. This swiveling elbow and the bushing are arranged as follows: The bushing is provided with a tapering aperture that is adapted to receive and tit the tapering end of the elbow, and the back pressure of the air entering the valve chest from the elbow against the inner end of the elbow presses it outwardly with enough presure to form an air tight joint between the elbow and the bushing. This valve chest is provided with a valve bore 71, in which a steel valve bushing 72 is secured by being pressed therein, and within this valve bushing a circular or round spool form of valve 7 3 is reciprocally and operatively fitted to control an operative system of air inlet and exhaust ports arranged in the valvel chest and cylinder to operatively reciprocate the hammer piston to drive the dolly to sharpen the heated ends of drill steel. The opposite ends of the valve bore of the valve chest are threaded, and plugs 74 are removably threaded to them, said plugs being provided with a wrench receiving portion 7 to enable them to be turned into and out of the valve chest, and they are arranged to screw against the opposite ends of the valve bushing 7 2. The entrance port of the valve chest of the hammer piston cylinder connects with a central circular recess port 7 6, that is formed in the valvel chest around the bushing, and the valve bushino is provided with a circumferential row of air inlet apertures 76A, that register with the air inl-et port 7 6. On the opposite sides of the central air inlet port 7 6 of the valve chest, and at equal distances from it, circular ports 77 and 7 8 are formed in the valve bore of the valve chest around the valve bushing, and these ports connect with ports 7 9 and S0, that lead through the shell of the cylinder to the opposite end portions of its hammer piston bore, which ports act as the air inlet and exhaust ports to and from the hammer piston bore of the cylinder. The ports 77 and 78 register with the interior of the valve bushing through a circumferential row of ports 78A as shown, and in the interior wall surface of the bushing, annular recessed grooves 7 8B are cut to eX- tend into one-half of the diameter of each circumferential row of apertures, and these grooves are arranged on the inner side of these two rows of apertures. They are adapted to permit the air to flow quickly and in ample volume into the cylinder ports 77 and 7 8. On the opposite sides of the ports 77 and 7 8, and at equal distances from them, a pair of circular recess ports S1 and 82 are formed in the valve bore of the valve chest. These ports are exhaust ports that are arranged to lead through the valve chest to the atmosphere. These exhaust ports 81 and 82 connect with the interior of the valve bushing by two circumferential rows of ports S3 that register opposite to these ports. The cylinder and valve chest are provided with port holes 84 and 85, which are shown in dotted lines in Fig. 3, and these ports extend from the opposite side portions of the central portions of the length of the hammer piston cylinder, up through the shell of the cylinder and into the eXtreme opposite end portions of the valve chest. These ports are arranged to permit live air from the cylinder to iiow on the forward and rearward strokes of the hammer piston to the opposite ends of the valve bushing and move the valve alternately to the opposite ends of its throw movement.

The valve comprises a spool-shaped valve that consists of a stem-shaped body portion 73, having collar portions 8G which are considerably larger in diameter than the stem portion, as shown in the sectional view, Fig. 3. My invention, however, contemplates any operative hammer piste-n reciprocating valve and port mechanism for driving the dolly.

The supply of compressed air enters the valve chest inlet ports through the hose 69, from the three function throttle valve 10 to the central part of the stem portion of the valve between its central collars, and moves the valve, allowing it to uncover either one or the other of the cylinders inlet po-rts to the hammer piston, which reciprocates the hammer piston, and as it reciprocates, a portion of the live air flows alternately through ports 84 and 85 to the opposite ends of the valve bushing and instantly and positively throws the valve to the opposite end of its reciprocal stroke, thus insuring a positively operating valve and apowerful and quick acting dolly driving hammer piston.

In order to insure that the dolly will make the return or rearward stroke of its reciprocal movement with the same relative speed as the hammer piston makes its rearward strokes, I provide the dolly, in addition to the suction force of the rearward strokes of the hammer piston, with a spring so arranged and connected thereto as to force the dolly rearwardly after each lolow of the hammer piston to the l'ull end of its operative rearward stroke by its resilient tension. My invention contemplates any resilient means hy which the dolly can he moved on the rearward strokes of its reciprocal movement. I preferal'ily, however, carry out this feature oit my invention in the following manner, and preferably use for this purpose an endless wire spring S7. This spring comprises a central yoke portion 88, that is long` enough to extend across the top of the dolly and is adapted to be hooked over a hook 89 formed in the top of the dolly by making a right angled slot 90 into the dolly, into which the yoke center 8S of the spring fits loosely, the slot being arranged to permit the wire to rest under the end of the hook. rll`he spring has two side wire 'portions 91, extendii'ig at right angles from the center oit the yoke portion. These side wires are several inches in length and are of equal length, and at their outer ends they are turned into a pair of coils 92, which are arranged opposite to and in alinement with each other. The ends ol these coils then extend in st aightportions 93, from the opposite side of the coils from the side wires 0l, and project from these coils in a direc` tion to cross the side wires 91 of the spring. These ends are of a trifle greater' length than the yoke portion, and at their terminal ends they are leent into curved hooks irl, which are arranged and adapted to hook over a pair ol trunnions 95 that are formed on the opposite sides of the guide flange and that are arranged with space enough around them to permit the hooked ends Jil ol the spring to be placed over them. In order to attach the spring operatively to the guide flange andthe dolly, place the hook ends ot' the spring over the trunnions of the guide flange lirst, and then spring the yoke end ol? the spring out over the hook of the dolly into the slot under the hook, which movement tightens the convolutions of the wire in the coils of the spring and places the yoke portion under a resilient tension that is sufiicient to move the dolly on the rearward strokes of its reciprocal movement in unison with the rearward strokes oli' the hammer piston. The yoke portion of the spring has to be unhooked :from the hook of the dolly every time a dolly is inserted in the guide flange and every time a dolly is removed from the guide flange to he replaced by another dolly. And in order to do this it is only necessary to grasp the yoke portion of the spring and spring it out from under the hook 89 of the dolly.

1n order to define the position of the dolly in the guide flange relative to the striking movement of the hammer piston, I provide the dolly with a shoulder as shown, which is larger than the shank end of the dolly and is normally held by the resilient tension of the springl against the end ol the hub portion of the guide flange.

The drill steel. sharpening end ol' the dolly may be made into any shape and number of lips it is desired to liorm on the end of drill steel or that it is desired to use in resharpening old dull drill bits, the term drill steel preterably applying to drill steel upon which rock cutting` lips are to he newly formed, and drill bits applying to old drills that require resharpening.

l preferably illustrate a dolly provided with loar lips arranged around its face end in tour equal Isized radially arranged rock cutting lips 9(3,as shown in Fig. When it is desired to change dollies to make a dill'erent number, or a dill'erent kind of rock cutting lips on the drill steel or drill bits, the cylinder is loosened on the slideway ot its snpporting arm by loosening the nuts on the bolts that clamp the base of the cylinder to the slideway. The cylinder and the dolly can then he ted lnickward from the anvil by the iteed screw itar enough on the supporting arm to enable the dolly to be drawn out of the hub portion et the guide 'flange without striking the anvil, and in order to prevent the leed screw from unscrewing 'troni its nut 33 by feeding the cylinder farther back on the arm than is necessary to remove the dolly, I provide the cylinder with a stop bar 9T. One end ol this stop bar is threaded to the anvil portion of the vise and the bar extends from the anvil alongside oit the cylinder and extends loosely through an aperture, 'formed in a laterally projecting lug 9S that lormed on one side oit the cylinder. Stop collars 9i) and l0() are mounted slidably on the rod on opposite sides ot' the lug, and they are cach provided with a set screw lOl, by which the collars may be secured on the outer end of the rod wherever desired on opposite sides of the lug.

The operator first moves the throttle valve to admit air to the bottoni ol the piston head 8 oit the piston 7 to raise this piston and the hammer block, and thus to open the jaws oil the drill steel gripping vise. Then, havingr inserted a heated drill bit or a bar of drill steel that he intends to make into a drill bit, into the die jaws of the vise, he moves the throttle valve to admit air to the top ot' the disk portion of the piston T oil the cylinder 3A, to move it and the hammer block and the upper die jaw down, thus closing the die jaws of the vise between its anvil and the hammer block to grip the drill steel. The operator then continues the movement of the valve to admit the compressed air actuating fluid into the valve chest of the dolly driving hammer piston cylinder which reciproca-tes the hammer piston of the cylinder and drives the dolly against the end of the drill bit and into the drill steel gripping die aws and forms new rook cutting lips on the end of the drill steel in oase it did not have any, o-r resharpens the old ones in case it had them and required resharpening. To stop the reciprocating action of the dolly it is only necessary to move the throttle valve backward to its starting point, which shuts the air off from the dolly engine and also opens the vise and releases the drill bit. My invention, however, contemplates my dolly driving mechanism connected to any suitable valve and supply of compressed air independently of the vlave and supply of air that controls the drill steel gripping vise.

lily invention provides a simple, highly el'licient dolly driving mechanism that can be applied to any operative drill bit gripping vise mechanism.

Having described my invention, what l claim as new and desire to secure by Letters Patent, is:

l. In a drill-bit sharpening machine, a vise having a stationary member and a movable member, a pair of cooperating' halfdies one carried by each oi' said members, said members having grooves at right-angles to said dies, die-securing bolts entering said members and having their heads non-revolubly disposed in said grooves, and nuts on the outer ends of said bolts engaging the outer ends of said half-dies.

Q. ln a drill-bit sharpening machine, a vise having a stationary member and a movable member, one of said members being disposed above the other, a pair of cooperating half-dies one carried by each of said members, said members having grooves at rightangles to said dies, die-securing bolts entering said members and having their heads non-revolubly disposed in said grooves, a spring for maintaining the upper bolt-head in its groove when not clamped against the die, and nuts on the outer ends of said bolts engaging the outer ends of said half-dies.

3. A drill-bit sharpening machine, a vise having a stationary member and a-movable member, one oi' said members being disposed above the other, a pair of cooperating halfdies one carried by each of said members, said members having grooves at rightangles to said dies, and said upper member having an internal spring-pocket adjacent its groove, die-securing bolts entering said members and having their heads non-revolubly disposed in said grooves, a spring in said spring-pocket for maintaining the upper bolt-head in its groove when not clamped against the die, and nuts on the outer ends of said bolts engaging the outer ends of said half-dies.

In testimony whereof l affix my signature in presenee of two witnesses.

JOHN GEORGE LEYNER. lWitnesses GEORGE R. Gnrnvn, G. SARGENT ELLIOTT.

Copies of this patent may 'be obtained for ve cents each, by addressing the f Commissioner of Patents, Washington, D. C. 

